Cognitive Adequacy and Tutela
Libertarian theory rests consent-based obligation on the will of self-owning persons — which leaves it owing an account of the person whose will is not competent to the act in front of them: the child, the person in decline, the buyer of a contract they cannot parse. Os Fundamentos Objetivos da Justiça answers by refusing to treat capacity as a property of persons at all. Capacity is a relation between a particular mind and a particular act, and it is measured act by act.
Holding a right and exercising it
The pivot is a distinction the book draws before anything else: being the holder of a right and being able to exercise it are different questions with different answers.
Holding follows from being a subject of rights at all. Exercise requires the rational capacity to understand the act being performed. So a person may retain their rights in full while lacking the capacity to perform some particular legal act — and, symmetrically, someone perfectly competent to buy a sandwich may be incompetent to grant a security interest. The book’s point is that these never collapse into one another: incapacity restricts what may be done, and never touches what is owned.
That framing already rules out one move and narrows another. Presuming full capacity for every decision ignores the second half outright. A fixed threshold like chronological age is a subtler target: such rules do restrict exercise while leaving titularity intact, which is the distinction the book wants — its objection is that age is used as an exclusive proxy for understanding, which is the thing that actually does the work.
The Principle of Cognitive Adequacy
The positive rule is stated directly:
O consentimento somente produzirá efeitos jurídicos quando a capacidade cognitiva do indivíduo for suficiente para compreender a natureza, os efeitos, os riscos e as consequências do ato praticado.
— Luiz Liberatus and Pedro Távora, Os Fundamentos Objetivos da Justiça
Consent produces legal effects only where the person’s cognitive capacity suffices to understand the nature, effects, risks and consequences of the act performed. Capacity, in the authors’ summary of their own rule, is not absolute and not binary; it is relative to the legal act performed.
Age survives only as evidence. There is a statistical relation between age and cognitive development, but it is not the ground of capacity: two people of the same age may understand entirely differently, and people of different ages may be equally competent to a given act. Age is a practical indicium — convenient for organising legal relations, and never an explanation of why a particular consent should bind.
The test
The book proposes a Test of Cognitive Adequacy to make this checkable without requiring expert assessment. It measures neither intelligence nor schooling, only whether the understanding was commensurate with the act. Seven elements must be understood:
- Nature of the act — which act this is: buying, selling, leasing, donating, lending, associating, undertaking an obligation. Someone who believes they are signing a lease while executing a sale has not consented.
- Object of the act — which specific good, right or obligation the decision falls on. Understanding that one is contracting is not enough.
- Immediate consequences — that the seller ceases to be owner; that the obligor becomes answerable for performance.
- Future consequences — effects that continue after the act, with the rule keyed to how significant those effects are rather than to how long they last.
- Risks assumed — what may be lost if expectations fail; the larger the exposure, the more understanding is demanded.
- Alternatives available — that the decision was not inevitable. The alternatives need not be equally attractive; the person must simply grasp that a choice existed.
- Irreversibility — whether the act can be undone, with irreversible acts requiring the most capacity of all.
The requirement scales rather than switching: risk, value at stake, the significance of the future effects, irreversibility and legal complexity each raise the bar. That proportionality is meant to block both failure modes at once — voiding simple acts on paternalist grounds, and validating ruinous ones because a formality was observed.
Tutela
Separating holding from exercise creates a gap, and tutela — guardianship — fills it. Its defining feature is what it is not:
A tutela não transfere a titularidade dos direitos.
— Luiz Liberatus and Pedro Távora, Os Fundamentos Objetivos da Justiça
Guardianship does not transfer ownership of the rights, and does not make the guardian an owner of the ward: Pessoas são sujeitos de direitos e jamais podem constituir objeto de propriedade — persons are subjects of rights and can never constitute an object of property. What the guardian receives is a right of their own whose object is the competence to exercise certain of the ward’s rights while the ward cannot. The powers that follow — administering property, contracting, representing, authorising medical treatment, defending physical integrity — exist solely for the ward’s protection, and carry correlative duties: the guardian may not use them for personal benefit, nor deliberately obstruct the ward’s developing autonomy.
Two routes create it. Originary tutela arises with the origination of a new subject of rights, from the objective fact of parenthood rather than from intention or planning; parents cannot simply abandon the position, though they may transfer it legitimately, and remain responsible until another guardian validly acquires it. Derived tutela covers capacity lost later to illness, accident, disability or age, and is acquired only by voluntary acceptance — objective preference criteria may order competing candidates, but create no duty to accept, and the position may remain vacant if no one takes it. The book is explicit that incapacity does not by itself impose a legal duty on third parties.
Tutela is bounded in scope and duration by the incapacity that justifies it: partial where the incapacity is partial, permanent where the incapacity is permanent, and extinguished, in that domain, the moment the ward can exercise the right themselves. It also carries liability — the guardian answers for consequences within the duties the position imposes, by virtue of the position rather than of authorship of the act.
What it settles, and what it doesn’t
Against the tradition, this is a distinctive combination. Rothbard’s treatment of children is among the most criticised parts of his system precisely because it derives strong parental rights from self-ownership while denying any positive obligation; the tutela construction reaches parental authority without ownership of the child, gets a non-abandonable original position out of the objective fact of parenthood, and keeps the ward’s rights formally intact throughout. It generalises, too: the same apparatus handles dementia, disability and the sophisticated-investor problem without a separate doctrine for each.
What it does not settle is enforcement against the vacancy it permits. If no one accepts derived tutela, the book allows the position to remain unfilled, and an incapacitated person with no guardian has rights that no one is competent to exercise. The authors treat that as a consequence of refusing to impose duties on non-consenting third parties — the same conclusion Rothbard reaches by a different route, and open to the same objection.
The act-relative standard also has an obvious cost the book does not price: it trades the arbitrariness of a bright line for case-by-case assessment, which is more accurate and much less predictable. Determining after the fact whether a particular person understood a particular contract is exactly the kind of enquiry that fixed thresholds exist to avoid, and in a competitive legal order it would fall to the arbitration chambers described elsewhere in the same book.
See Also
- Os Fundamentos Objetivos da Justiça - the treatise this doctrine comes from
- The Title-Transfer Theory of Contract - what a contract transfers, once valid consent is established
- Voluntary Slavery, Debt, and the Title-Transfer Theory of Contract - the inalienability question this book answers from the continuity of consent
- Self-Ownership - the holding that cognitive adequacy governs the exercise of
- Delimitation and the Origin of Property - the companion doctrine on what may be contracted over
- Nonaggression and Property Rights - consent’s role in the normative core
- Market Anarchism and Private Law - the institutions that would apply the test in practice
- Natural Law - the hub for reason-knowable justice above positive law, where this doctrine is adopted
Sources
- Os Fundamentos Objetivos da Justiça - Chapters 4 and 5, on consent, autonomy, capacity and guardianship; Chapter 11 for the guardian’s liability